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Comment on Do i need to install a driver?

I was actually impressed when I took a bus across state lines in the U.S. recently.

Someone was complaining about the charger on their seat not working.

Turns out that the driver has full control of the power to the USB ports on the bus and can turn them off and on at will… and they apparently they turn them off BY DEFAULT.

If someone WERE to figure out a way to get from the USB port in the seats to the CAN Bus on the vehicle itself, having a hard-wired physical switch that cuts power/signal to the ports is potentially a fairly effective security measure as long as there’s not a memory buffer you can compromise and run stuff from.

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Bonehead@kbin.social ⁨2⁩ ⁨years⁩ ago
The real question is...why are the data lines connected to anything in these chargers, let alone connected to the CAN Bus? There's no need for security is you just don't have access. Something tells me either the company doesn't like their customers, or the bus driver was just a dick.

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- PopcornPrincess@lemmy.world ⁨2⁩ ⁨years⁩ ago
  Why not both?
  
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- Mongostein@lemmy.ca ⁨2⁩ ⁨years⁩ ago
  Or it might just automatically turn them off when so fools aren’t draining the battery without the bus running.
  
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herrvogel@lemmy.world ⁨2⁩ ⁨years⁩ ago
I very much doubt there’s any sort of workable data connection between the CAN bus and those sockets. The mechanism that lets the driver switch them on or off at will doesn’t necessarily have to connect those things to anything but a power rail.

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- Swedneck@discuss.tchncs.de ⁨2⁩ ⁨years⁩ ago
  i really wish school just had a day where they covered how a USB port works, showing how you can literally just cut all but the power cables to limit things to charging only
  
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  - ragebutt@lemmy.dbzer0.com ⁨3⁩ ⁨months⁩ ago
    That’s old dumb usb. USB c also needs a 5.1kohm resistor between cc1 and gnd (or data lines to negotiate fast charging but then its a whole thing)
    
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TseseJuer@lemmy.world ⁨2⁩ ⁨years⁩ ago
this is dumb there is 100% no data connection to those

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- MaxVoltage@lemmy.world ⁨2⁩ ⁨years⁩ ago
  this dude hasnt been awake on adhd meds for 4 days and it shows
  
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